Starrett 440 Depth Micrometers have a 63.5mm (2.1/2") base and 3.2mm (1/8") diameter measuring rods.
Starrett 445 Depth Micrometers have a 100mm (4") base and 4mm diameter measuring rods.
- Reading surfaces have a satin chrome finish that resists rust.
- Ring-type lock nut for quick and sure locking.
- Combination ratchet and speeder for uniform pressure and quicker adjustment.
- Includes protective case.